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Keyed up with lift pump humming, but before starting, the gauge reads about 5PSI. At idle it falls to what looks like 0 to me. Is that indicating a blockage at the fuel filter? I'm thinking I need to take the whole housing off and clean it out with how dirty my filter was. Also, here's a photo...

This is after the fuel filter and before the IP.

Picked up a fuel pressure test kit today. I'm guessing this brass piece in the line between my fuel filter and IP is where I attach this kit. Is that correct?

Just siphoned this sample from my main tank. Looks pretty clean to me. I was going to do my aux tank also, but am having trouble getting the tube in far enough to grab any fuel. Presuming that diesel bugs thrive in the dark I've sealed this jar and put it in a dark cupboard in my shop.

I live in western Washington State so I think we're ULSD. I occasionally use some Lucas or Amsoil injector cleaner.

I'm still researching where to find my ground locations. Just wanted to mention that I just did a short test drive through the neighborhood after letting the truck warm up for 10+ minutes. I was in/around it this entire time and did not notice any engine revving at idle. Also nothing on my test...

I have an OBDLink MX+ which is a Bluetooth OBD-II reader. I can read live data with it, but I don't know if I can read pump calibration numbers. I'll try to figure that out. I'll take a look at that tomorrow. Thanks for the help!

Noticed recently that my truck (1996 AM General Hummer with GM 6.5 TD) would sporadically rev its engine just a bit while idling. Took it for a spin and once while slowing down from 50MPH or so to take a turn the engine revved while I was off the throttle. I've had a failing crank position...